如果不希望在部署时验证服务器设置，也可以在此方案中使用非复合引用。
You could also use a non-composite reference in this scenario if you do not want to verify server settings when you deploy.
为了避免这个问题的出现，您可以定义复合类型来封装数值类型，并将这个复合类型置为空来表示空引用。
To avoid this problem, you can define a complex type to wrap the value type and set the complex type to be null to indicate a null reference.
注意，在处理提升的引用时，SCA将引用视为跨复合体惟一的。
Notice that SCA treats references as unique across the composite when handling promoted references.
类似地，在SCA复合集中定义的sca属性可以直接用作Spring应用程序上下文中的bean引用。
Similarly, the SCA properties defined in the SCA composite can be directly used as bean references within your Spring application context.
在这种情况下，bean引用的类型将由Tuscany运行时从bean类定义中进行内省(introspect)，以验证它并将它与在复合集中定义的sca应用类型相匹配。
In such cases, the type of the bean references will be introspected by Tuscany runtime from the bean class definition to validate and match it with the type of sca references defined in the composite.
提供一个标签，它通过引用复合框中的文本字段来标识复合框。
Provide a label that labels the combo box by referencing the text field in the combo box.
因此，通过添加一个引用和访问减法服务的组件，就可以轻松地向SCA复合文件添加新的需求。
This new requirement can easily be added to the SCA composite file by adding a single reference and a component that accesses the subtract service.
用其他类型定义的类型，如引用。第四章将介绍另外两种复合类型：指针和数组。
A type, such as a reference, that is defined in terms of another type. Chapter 4 covers two additional compound types: Pointers and arrays.
用其他类型定义的类型，如引用。第四章将介绍另外两种复合类型：指针和数组。
A type, such as a reference, that is defined in terms of another type. Chapter 4 covers two additional compound types: Pointers and arrays.
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